I contacted the Asus support. They first thought it was listed precisely where you suggested. After a while of digging deeper, they asked me to fill out a form which would be forwarded to their engineering team to make the option available perhaps in the next bios update

I contacted the Asus support. They first thought it was listed precisely where you suggested. After a while of digging deeper, they asked me to fill out a form which would be forwarded to their engineering team to make the option available perhaps in the next bios update